Coffin of Asheson Steam Discovery

What is Coffin of Ashes?

Coffin of Ashes is a
RPG, Adventure, Anime PC game, developed by DigitalEZ, available on Steam and published by .

Delilah is an ordinary school girl who accidentally discovers an old mansion on a rainy night. As her exploration in the mansion continues, she finds many mysterious phenomena that can't be explained. In this mansion covered by ashes, what's the secret hidden deep underground?